Reconciliation of Provision For Income Taxes Determined at Local Income Tax Rate to Effective Income Tax Rate (Detail) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Reconciliation of Effective Income Tax Rate [Line Items]
Pre-tax income	$ 18,296,275	$ 18,957,523	$ 34,048,633	$ 35,392,663
United States federal corporate income tax rate	34.00%	34.00%	34.00%	34.00%
Income tax computed at United States statutory corporate income tax rate	6,220,733	6,445,557	11,576,535	12,033,505
Loss not recognized as deferred tax assets	257,658	196,876	600,187	425,909
Non-deductible expenses (income)	81,674	(57,581)	74,444
Change in fair value of warrants	14,960	(409,933)	136,241	(898,113)
Rate differential for PRC earnings	(1,724,138)	(1,645,697)	(3,267,003)	(3,055,799)
Other	(1,278)	62,225	6,551	9,099
Effective tax expense	$ 4,849,609	$ 4,591,447	$ 9,126,955	$ 8,514,601

Income Tax Reconciliation Change in Fair Value of Warrants

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The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to changes in the valuation allowance for deferred tax assets in the period.

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The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to total foreign income tax expense or benefit. The foreign income tax expense or benefit difference represents the income tax expense or benefit at applicable domestic statutory income tax rates applied to foreign earnings or loss for the period versus the foreign income tax expense or benefit calculated by applying the appropriate foreign tax rates.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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The sum of the differences between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to nondeductible expenses under enacted tax laws, or differences in the methodologies used to determine expense amounts for financial statements prepared in accordance with generally accepted accounting principles and enacted tax laws.

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The sum of other amounts reflected in the reconciliation of the statutory tax provision (benefit) to the actual tax provision (benefit).

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